Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster Session: Magnetic Confinement
P 12.8: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Spectroscopic Impurity Survey in Wendelstein 7-X — •Birger Buttenschön1, Rainer Burhenn1, Henning Thomsen1, Wolfgang Biel2, Jochen Assmann2, Klaus-Peter Hollfeld2, and the Wendelstein 7-X Team1 — 1Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17491 Greifswald, Deutschland — 2Forschungszentrum Jülich GmbH, Jülich, Deutschland
The High Efficiency eXtreme ultraviolet Overview Spectrometer (HEXOS) has been developed specifically for impurity identification and survey purposes on the Wendelstein 7-X stellarator. This spectrometer system, consisting of four individual spectrometers, covers the wavelength range between λ = 2.5nm and λ = 160nm, observing the intense resonance lines of relevant Mg-, Na-, Be- and Li-like impurity ions as well as the high-Z W/Ta quasi-continua.
During the first operation phase of W7-X, commissioning of HEXOS was finished by providing an in-situ wavelength calibration. The permanently acquired spectra are evaluated to monitor the overall impurity content in the plasma, and serve as an indicator for unintended plasma-wall contact possibly leading to machine damage.
HEXOS results from the first operation phase of W7-X are presented and discussed with respect to future scientific exploitation of the available data.